Biogas slurry residue has the characteristics of continuity and Large quantity. It has also a great difference with conventional liquid fertilizers. A fertilizer machinery used for biogas slurry dark field irrigation is designed based on the physical parameters of biogas slurry, and it can complete the operations of ditching, fertilizing, ridging, the suppression of process at one time. An distributor adopted by the fertilizer spreader can change continuous flow into intermittent flow and concentrate fluid energy, as a result the anti-blocking capability of the flow are improved to some extent. In addition, the maximum stress of fertilizing shovel applied the job force are in the allowable stress range. According to the calculations of the mechanical traction power for the entire fertilizer, DFH X904 tractor can meet the power demand of the fertilizing machinery when operating.